High Energy Gamma Rays from p+X, X=Cu, Ag, Au at 34 MeV

• Main Authors: Luke, S J, Dietrich, F S, Chadwick, M B, Gossett, C A, Kaplan, M S, McLain, B T, Vandenbosch, R, Kicinska-Habior, M
• Format: Conference Proceeding
• Language: English
• Subjects: ANGULAR DISTRIBUTION; BREMSSTRAHLUNG; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CROSS SECTIONS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PROTONS; SPECTROSCOPY; TARGETS; WASHINGTON
• ISSN: 0094-243X; 1551-7616

In this paper we present results from the measurement of the gamma ray yield in the reaction of 34-MeV protons on Cu, Ag and Au. The protons were produced by the University of Washington superconducting linac. The gamma rays were measured using a large NaI and two large BaF{sub 2} detectors. Angular distributions were obtained for each of the three targets. Data for the Cu and Ag target were taken at six lab angles between 35 and 135 degrees, while data were taken at eight lab angles between 35 and 135 degrees for the Au target. The data were compared to several models. These included Hauser-Feshbach and direct-semidirect (DSD) calculations. We also compared the measurements to proton-nucleus bremsstrahlung calculations. The bremsstrahlung calculations greatly underpredicted the cross section and produced an angular distribution which was too flat. The Hauser-Feshbach calculations reproduced the yield of the softer portion of the spectrum reasonably well for all three targets. The DSD calculations reproduced the yield and angular distributions quite well for energies above about 20 MeV. However, the yields were underpredicted in the 15-18 MeV region, which suggests that multistep mechanisms may be needed for this target.